CN103323401B - Based on the THz wave real time imagery method that optical parameter is changed and device - Google Patents
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Abstract
The invention provides the THz wave real time imagery method based on optical parameter is changed and device, to solve the difficult problem that in the indirect imaging technique of existing THz wave, image taking speed and signal to noise ratio (S/N ratio), resolution can not be taken into account.This formation method is: relevant THz ripple to irradiate after object with near infrared pump light with conversion equipment on conllinear matching way simultaneously incident THz wave optical parameter, the near infrared ideler frequency light conjugated image obtained, through optical imaging system imaging acquisition, obtains intensity, spectral distribution and wavefront phase information wherein; The intensity of ideler frequency spectrum, spectral distribution and wavefront phase information are converted to the intensity of THz wave spectrum, spectral distribution and wavefront phase information.The present invention, without the need to scanning and pixel building-up process, realizes high speed real time imagery; Without spontaneous radiation, signal to noise ratio (S/N ratio) is high, can to weak THz ripple image formation; System architecture is simple, good reliability.
Description
Technical field
The invention belongs to optical imaging field, be specifically related to a kind of THz wave real time imagery method based on optical parameter is changed and device thereof.
Background technology
Terahertz (THz) radiation is commonly referred to as the electromagnetic wave of frequency between 0.1THz ~ 10THz, and its wave band is between microwave and far infrared.THz electromagnetic radiation has very unique character, it can through various biosome, dielectric substance and gaseous substance, and the rotational frequency of many light molecules, large molecule are lived, the vibration mode of functional group and the resonance frequency of biomacromolecule are all in THz wave band.In addition, THz spectrum also cover the low energy exciting phenomena of electronic material, the low frequency modes of condensed state phase media, the phonon of solid material, magnon, plasmon and fluid molecule vibration equal excitation phenomenon.Therefore, these media have abundant absorption and dispersion properties at THz wave band, by measure and the THz signal analyzing sample just can obtain about the material composition in material and physics, chemistry and biological information.Nearly ten years, due to the development of the science and technology such as ultra-fast optical, semiconductor, electronics, the generation of THz ripple and Detection Techniques are also ripe gradually, therefore, two of THz science and technology is applied greatly substantially---and THz spectrum and THz imaging, have wide practical use in fields such as national security, national economy and scientific researches.
Because THz wave band is beyond far infrared, wavelength is long, photon energy is little, at present, the device of direct measurement THz ripple image has refrigeration mode and non-refrigeration type microstructure microbolometer array (Microbolometergrid), their resolution limitations is in the size (being hundreds of micron at present) of Microbolometer, refrigeration mode detector wherein must freeze at liquid helium under (4K) and work, and buys, use and maintenance cost is high.Therefore, various countries have developed the indirect THz ripple image measuring method based on THz spectral technique that can work at normal temperatures.Common THz spectral technique has THz time domain spectrum (TDS) technology, time resolved spectroscopy technology and THz Emission Spectroscopy, but all belongs to wide-band linearity spectrographic detection technology.The basic imaging principle of response is utilize THz imaging system that the information (comprising the two-dimensional signal of amplitude and phase place) of the transmission spectrum of Imaged samples or reflectance spectrum is carried out processing, analyzing, obtain the THz image of sample.The basic comprising of terahertz imaging system compared with TDS, many image processing apparatus and scan controller.Utilize reflective scan or transmission scan can imaging, this depends primarily on the character of Imaged samples and imaging system.According to different needs, different formation methods can be adopted.Formation method based on current wide-band linearity spectrographic detection technology has time domain point by point scanning imaging and real-time focal plane imaging.Point by point scanning imaging is relatively little by background interference, and signal to noise ratio (S/N ratio) is high by (10
4), but due to point by point scanning imaging time very long, imaging time depends on analyzing spot quantity, become a width as need dozens of minutes even several hours.Real-time focal plane imaging can overcome the long shortcoming of imaging time, accomplish real-time monitoring, but imaging noise is low, resolution is poor (grade).Therefore new method and the proposition of experimental program are the main paties addressed this problem, the key that structure is simple, stable performance, high sensitivity and high s/n ratio imaging system are THz imaging technique investigation and application.
Summary of the invention
The present invention aims to provide a kind of THz wave real time imagery method based on optical parameter is changed and device thereof, to solve the difficult problem that in the indirect imaging technique of existing THz wave, image taking speed and signal to noise ratio (S/N ratio), resolution can not be taken into account.
Technical scheme of the present invention is as follows:
Based on the THz wave real time imagery method that optical parameter is changed, its special character is: comprise the following steps:
1] a branch of relevant THz ripple and a branch of near infrared pump light is produced;
2] relevant THz ripple irradiates object, produces the THz ripple image carrying object intensity and spectral distribution information;
3] step 2] the THz ripple image that obtains and near infrared pump light be with conversion equipment on conllinear matching way simultaneously incident THz wave optical parameter, produce second nonlinear effect, running, the bandwidth sum PRI characters of described THz ripple image and near infrared pump light are identical, and the THz ripple image that on THz wave optical parameter, conversion equipment output power is amplified also produces the near infrared ideler frequency light conjugated image of intensity higher than THz ripple image two magnitudes after power amplification; On described THz wave optical parameter, conversion equipment comprises nonlinear images conversion gain medium;
4] step 3] in the near infrared ideler frequency light conjugated image that obtains through optical imaging system imaging acquisition, obtain intensity, spectral distribution and wavefront phase information wherein;
5] according to step 4] in the intensity of near infrared ideler frequency light conjugated image, spectral distribution and the wavefront phase information that obtain, calculate the THz ripple frequency that the frequency of near infrared ideler frequency light conjugated image is corresponding, the intensity of ideler frequency spectrum, spectral distribution and wavefront phase information are converted to the intensity of THz wave spectrum, spectral distribution and wavefront phase information.
Preferably, above-mentioned nonlinear images conversion gain medium is GaSe crystal or GaP, GaAs, DAST, ZGP.
Preferably, the input path of nonlinear images conversion gain medium is also provided with off axis paraboloidal mirror group, off axis paraboloidal mirror group comprises the confocal gold-plated off-axis parabolic mirror of two panels.
Preferably, above-mentioned steps 1] in, relevant THz ripple is produced through relevant THz wave producer conversion by another bundle near infrared pump light.
Preferably, above-mentioned near infrared pump light injects relevant THz wave producer via the attenuator of half-wave plate and Polarization Controller composition, and it is vertical polarization that attenuator is used for controlling to select suitable pump light pulse energy and control to export pumping light polarization direction.
Preferably, above-mentioned near infrared pump light injects nonlinear images conversion gain medium through the second optical alignment contracting beam system.
Preferably, regulate before or after attenuator and make beam collimation, then inject relevant THz wave producer, beam collimation is realized by the first optical alignment contracting beam system.
Preferably, above-mentioned steps 4] in, between nonlinear images conversion gain medium and optical imaging system, be provided with near infrared wave filter.
Preferably, optical imaging system comprises the NIR lens and Near Infrared CCD that set gradually along light path.
Based on the THz wave real-time imaging devices that optical parameter is changed, its special character is: comprise conversion equipment, optical imaging system and computing machine near infrared pumping source, relevant THz wave producer, THz wave optical parameter, on THz wave optical parameter, conversion equipment comprises nonlinear images conversion gain medium; Relevant THz wave producer exports relevant THz ripple, irradiate object, produce the THz ripple image carrying object spectral information, the light that THz ripple image and near infrared pumping source send is jointly as the input of conversion equipment on THz wave optical parameter, on THz wave optical parameter, conversion equipment is connected with computing machine through optical imaging system, and running, the bandwidth sum PRI characters of THz ripple image and the light that near infrared pumping source sends are identical.
Preferably, above-mentioned nonlinear images conversion gain medium is the Effects in Nonlinear Media with Gain such as GaSe crystal or GaP, GaAs, DAST, ZGP.
Preferably, the input path of above-mentioned nonlinear images conversion gain medium is also provided with the off axis paraboloidal mirror group be made up of the gold-plated off-axis parabolic mirror that two panels is confocal.
Preferably, the light that near infrared pumping source sends is divided into two bundles through beam splitting chip, is a branch ofly incident to relevant THz wave producer, and another bundle is incident to conversion equipment on THz wave optical parameter.
Preferably, near infrared pumping source and THz wave optical parameter are also provided with the second optical alignment contracting beam system between conversion equipment.
Preferably, the first optical alignment contracting beam system is also provided with between near infrared pumping source and relevant THz wave producer and/or the attenuator that is made up of half-wave plate and Polarization Controller.
Preferably, between nonlinear images conversion gain medium and optical imaging system, near infrared wave filter is provided with.
Preferably, optical imaging system comprises the NIR lens and Near Infrared CCD that set gradually along light path.
The present invention has the following advantages:
1, producing near infrared image without the need to scanning and pixel building-up process to THz ripple image is changed simultaneously, high speed real time imagery is realized; Meanwhile, based on switch technology on parameter, in the time window of pumping, parametric process occurs, without spontaneous radiation, signal to noise ratio (S/N ratio) is high, fills up the blank of domestic and international high resolving power THz ripple nonlinear optics Real Time Imaging Technology;
2, on optical parameter switch technology itself to have single-pass gain high and can the advantage such as cascade effect, at imaging enlarged image signal simultaneously, can to weak THz ripple image formation;
3, system architecture is simple, good reliability.
Accompanying drawing explanation
Fig. 1 is principle framework figure of the present invention;
Fig. 2 is the structural representation of the embodiment of the present invention;
Fig. 3 is THz wavelength after the amplification of the embodiment of the present invention and produces ideler frequency optical wavelength corresponding relation;
Fig. 4 .1 and 4.2 is respectively ideler frequency light conjugated image formed by optical resolution inspection panel and the THz image after changing (resolution inspection panel parameter: No. 1 width of fringe is 20 μm, 1mm line is to being 25);
Drawing reference numeral illustrates:
1-near infrared pumping source; 2-beam splitter; 3-half-wave plate; 4-Polarization Controller; 5-first optical alignment contracting beam system; 6-is concerned with THz wave producer; 7-object; The gold-plated off-axis parabolic mirror A of 8-; 9-45 ° of total reflective mirror; 10-second optical alignment contracting beam system; The gold-plated off-axis parabolic mirror B of 11-; 12-nonlinear images conversion gain medium; 13-near infrared window; 14-NIR lens; 15-Near Infrared CCD; 16-computing machine.
Embodiment
As shown in Figure 1, principle of the present invention is: according to photon energy law of conservation, because THz ripple photon energy is little, in the process that optical parameter is changed, can obtain the idler photon that near infrared frequency is slightly less than pump light frequency under near infrared pump photon and THz glistening light of waves interact, its frequency relation meets ω
ideler frequency light=ω
pump light-ω
tHzideler frequency light becomes conjugate image with THz ripple, utilize ideler frequency light to realize indirect imaging, this process has the feature of high-gain, high noise and wide coupling bandwidth, adopts the near infrared CDD of technology maturation to obtain the image information of the ideler frequency light by THz wave band being converted to near-infrared band.To utilize in optical parameter THz light in transfer process with ideler frequency light frequency one_to_one corresponding and phase place is identical, the THz image information of the imaging characteristic indirect inspection sample of conjugation each other, compare line spectrum imaging technique and obtain higher imaging signal to noise ratio (S/N ratio) (10
9) and resolution (micron order).
Based on the THz wave real time imagery method that optical parameter is changed, comprise the following steps:
1] a branch of relevant THz ripple and a branch of near infrared pump light is produced;
2] relevant THz ripple irradiates object 7, produces the THz ripple image carrying object 7 intensity and spectral distribution information;
3] step 2] the THz ripple image that obtains and near infrared pump light be with conversion equipment on conllinear matching way simultaneously incident THz wave optical parameter, produce second nonlinear effect, described THz ripple image should be identical with the running of near infrared pump light, bandwidth sum PRI characters, and the THz ripple image that on THz wave optical parameter, conversion equipment output power is amplified also produces the near infrared ideler frequency light conjugated image of intensity higher than THz ripple image two magnitudes after power amplification; Fig. 3 is the ideler frequency optical wavelength corresponding relation that the THz wave-wave after amplifying is long and produce;
4] step 3] in the near infrared ideler frequency light conjugated image that obtains through optical imaging system imaging acquisition, obtain intensity, spectral distribution and wavefront phase information wherein, reach the object of real time imagery.
5] near infrared ideler frequency light conjugated image is reduced into THz ripple image information: according to step 4] middle intensity, spectral distribution and the wavefront phase information obtained, calculate the THz ripple frequency that the frequency of near infrared ideler frequency light conjugated image is corresponding, the intensity of ideler frequency spectrum, spectral distribution and wavefront phase information are converted to the intensity of THz wave spectrum, spectral distribution and wavefront phase information.
Wherein, step 1] relevant THz wave producer 6 exports relevant THz ripple two kinds of mode: Yi Zhongshi: the relevant THz wave producer 6 of near infrared pump light incidence of the linear polarization produced by near infrared pumping source 1, preferably, after near infrared pumping source 1 produces near infrared pump light, adopting the attenuator be made up of half-wave plate 3 and Polarization Controller 4 to control to select suitable pump light pulse energy and control to export pumping light polarization direction is vertical polarization, better, regulate before or after attenuator and make beam collimation, then relevant THz wave producer 6 is injected, export relevant THz ripple, another kind is: relevant THz wave producer 6 adopts independently THz ripple coherent source, exports relevant THz ripple, beam collimation is regulated to be realized by the first optical alignment contracting beam system 5.
Step 3] in THz wave optical parameter on conversion equipment comprise nonlinear images conversion gain medium 12, specifically can adopt low to THz absorption coefficient and there is the GaSe crystal or GaP, GaAs, DAST, ZGP crystal etc. of high optical nonlinearity coefficient, THz ripple image and near infrared pump light are with conversion equipment on conllinear matching way simultaneously incident THz wave optical parameter, produce second nonlinear effect, the THz ripple image that output power is amplified also produces the near infrared ideler frequency light conjugated image of intensity higher than THz ripple image two magnitudes after power amplification.Preferably, the front of nonlinear images conversion gain medium 12 is provided with off axis paraboloidal mirror group, the confocal gold-plated off-axis parabolic mirror A8 that the preferred two panels of off axis paraboloidal mirror group sets gradually along light path and gold-plated off-axis parabolic mirror B11 forms, and the collimation controlling light beam is dispersed or converges.
Step 3] THz ripple image and near infrared pump light generation second nonlinear effect time need the length to nonlinear images conversion gain medium 12, inject the direction and intensity of light beam and carry out controlling to adjust making the THz image of output and ideler frequency conjugate image obtain most high fidelity.Adjusting the control of nonlinear images conversion gain medium 12 length, is techniques well known; To the control of the direction and intensity of injection light beam, realized by half-wave plate 3 and Polarization Controller 4.
Step 4] in, in order to make near infrared ideler frequency light conjugated image better collected, between nonlinear images conversion gain medium 12 and Near Infrared CCD 15, be provided with near infrared wave filter.Near infrared wave filter specifically can adopt near infrared window 13, for filtering the THz ripple image after amplification.
Step 4] in optical imaging system be a NIR lens 14 and Near Infrared CCD 15 set gradually along light path.
As shown in Figure 2, based on the THz wave real-time imaging devices that optical parameter is changed, comprise conversion equipment, optical imaging system and computing machine 16 near infrared pumping source 1, relevant THz wave producer 6, THz wave optical parameter; Relevant THz wave producer 6 exports relevant THz ripple, irradiate object 7, produce the THz ripple image carrying sample spectra information to be imaged, carry the input as conversion equipment on THz wave optical parameter of near infrared pump light that the THz ripple image of sample spectra information to be imaged and near infrared pumping source 1 produce, need to guarantee that running, the bandwidth sum PRI characters of THz ripple image and near infrared pump light are identical, on THz wave optical parameter, conversion equipment is connected with computing machine 16 through optical imaging system more successively.
Below each several part of this imaging device is described in detail:
Near infrared pumping source 1: can be pulse or continuous running, arrowband or broadband, low repetition or the pumping source of Gao Zhongying.Need when pumping source is short pulse to carry out impulsive synchronization.Common, pumping source adopts ns level or fs level pumping source, as Seeded PR II 8010 type macro-energy single longitudinal mode adjusts the Nd:YAG laser instrument of Q.
Relevant THz wave producer 6: for exporting relevant THz ripple, the THz pulse that relevant THz wave producer 6 exports is less than the pulse width of pump light.Relevant THz wave producer 6 exports relevant THz ripple two kinds of mode: Yi Zhongshi: the relevant THz wave producer 6 of near infrared pump light incidence of the linear polarization produced by near infrared pumping source 1, this near infrared pumping source 1 and the pumping source being incident to conversion equipment on THz wave optical parameter, can be same, send near infrared pump light by a near infrared pumping source 1 and be divided into two bundles, wherein a branch of incidence is concerned with THz wave producer 6, and another bundle is incident to conversion equipment on THz wave optical parameter; Preferably, after the near infrared pump light that near infrared pumping source 1 produces, the attenuator be made up of half-wave plate 3 and Polarization Controller 4 is adopted to control to select suitable pump light pulse energy and control to export pumping light polarization direction, better, first optical alignment contracting beam system 5 is set before or after attenuator, regulates and make beam collimation, then inject relevant THz wave producer 6, export relevant THz ripple, as shown in Figure 2; Preferably, separate another bundle near infrared pump light by near infrared pumping source 1 and inject nonlinear images conversion gain medium 12 after the second optical alignment contracting beam system 10 collimates, if desired, need total reflective mirror 9 that light path is carried out correct guidance.Another kind is: relevant THz wave producer 6 adopts independently THz ripple coherent source, exports relevant THz ripple.
Conversion equipment on THz wave optical parameter: comprise nonlinear images conversion gain medium 12, specifically can adopt low to THz absorption coefficient and there is the Effects in Nonlinear Media with Gain such as GaSe crystal or GaP, GaAs, DAST, ZGP of high optical nonlinearity coefficient, THz ripple image and near infrared pump light are with conversion equipment on conllinear matching way simultaneously incident THz wave optical parameter, produce second nonlinear effect, the THz ripple image that output power is amplified also produces the near infrared ideler frequency light conjugated image of intensity higher than THz ripple image two magnitudes after power amplification.Preferably, the front of nonlinear images conversion gain medium 12 is provided with off axis paraboloidal mirror group, the gold-plated off-axis parabolic mirror of the preferred two panels of off axis paraboloidal mirror group, the collimation controlling light beam is dispersed or converges.
In order to make near infrared ideler frequency light conjugated image better collected, between nonlinear images conversion gain medium 12 and Near Infrared CCD 15, be provided with near infrared wave filter.Near infrared wave filter specifically can adopt near infrared window 13, for filtering the THz ripple image after amplification.
Optical imaging system comprises the NIR lens 14 and Near Infrared CCD 15 that set gradually along light path, and Near Infrared CCD 15 can select adequate resolution, sensitivity and responsive bandwidth device as required.Such as, the Near Infrared CCD 15 of high resolving power and sensitivity.
In Fig. 2, gold-plated off-axis parabolic mirror B11 is positioned at the front of nonlinear images conversion gain medium 12 just, just also need through gold-plated off-axis parabolic mirror B11 when another bundle near infrared pump light injects nonlinear images conversion gain medium 12, now, in order to saving components, save space, aperture can be provided with on gold-plated off-axis parabolic mirror B11, near infrared pump light injects nonlinear images conversion gain medium 12 by the aperture on gold-plated off-axis parabolic mirror B11, also not affecting THz ripple image injects nonlinear images conversion gain medium 12 simultaneously.
The major parameter of this device is: above change THz pulsewidth 5ns, upper THz wave band of changing is into 0.3-10THz, the phase matching angle of THz ripple image and near infrared pump light is changed by controlling high-accuracy rotation platform, the pump power of choose reasonable near infrared pump light and the length of nonlinear images conversion gain medium 12, to increase the output power of ideler frequency light conjugated image, improve imaging system stability.Adjust the Nd:YAG laser instrument of Q as pump light source the single longitudinal mode of injection seeded, the leading indicator of this laser instrument is: single longitudinal mode (live width 0.003cm
-1), wavelength 1064nm, pulsewidth 8ns, single pulse energy is greater than 150mJ, the focal length 300mm of NIR lens 14.Fig. 4 .1 and 4.2 is respectively based on said apparatus and parameter, select optical resolution inspection panel as object 7, to the THz image after ideler frequency light conjugated image formed by optical resolution inspection panel and conversion, this optical resolution inspection panel parameter: No. 1 width of fringe is 20 μm, 1mm line is to being 25.Ideler frequency light conjugated image and the THz image after changing are conjugate relations, and the THz image resolution ratio after conversion is high, and signal to noise ratio (S/N ratio) is high.
Claims (10)
1., based on the THz wave real time imagery method that optical parameter is changed, it is characterized in that: comprise the following steps:
1] a branch of relevant THz ripple and a branch of near infrared pump light is produced;
2] relevant THz ripple irradiates object, produces the THz ripple image carrying object intensity and spectral distribution information;
3] step 2] the THz ripple image that obtains and near infrared pump light be with conversion equipment on conllinear matching way simultaneously incident THz wave optical parameter, produce second nonlinear effect, running, the bandwidth sum PRI characters of described THz ripple image and near infrared pump light are identical, and the THz ripple image that on THz wave optical parameter, conversion equipment output power is amplified also produces the near infrared ideler frequency light conjugated image of intensity higher than THz ripple image two magnitudes after power amplification; On described THz wave optical parameter, conversion equipment comprises nonlinear images conversion gain medium;
4] step 3] in the near infrared ideler frequency light conjugated image that obtains through optical imaging system imaging acquisition, obtain intensity, spectral distribution and wavefront phase information wherein;
5] according to step 4] in the intensity of near infrared ideler frequency light conjugated image, spectral distribution and the wavefront phase information that obtain, calculate the THz ripple frequency that the frequency of near infrared ideler frequency light conjugated image is corresponding, the intensity of ideler frequency spectrum, spectral distribution and wavefront phase information are converted to the intensity of THz wave spectrum, spectral distribution and wavefront phase information.
2. the THz wave real time imagery method based on optical parameter is changed according to claim 1, is characterized in that: described nonlinear images conversion gain medium is GaSe crystal or GaP, GaAs, DAST, ZGP crystal.
3. the THz wave real time imagery method based on optical parameter is changed according to claim 2, it is characterized in that: in the input path of nonlinear images conversion gain medium, be also provided with off axis paraboloidal mirror group, off axis paraboloidal mirror group comprises the confocal gold-plated off-axis parabolic mirror of two panels.
4. the THz wave real time imagery method based on optical parameter is changed according to claim 1, is characterized in that: step 1] in, relevant THz ripple is produced through relevant THz wave producer conversion by another bundle near infrared pump light.
5. the THz wave real time imagery method based on optical parameter is changed according to claim 4, it is characterized in that: near infrared pump light injects relevant THz wave producer via the attenuator of half-wave plate and Polarization Controller composition, it is vertical polarization that attenuator is used for controlling to select suitable pump light pulse energy and control to export pumping light polarization direction.
6. the THz wave real time imagery method based on optical parameter is changed according to claim 5, is characterized in that: regulate before or after attenuator and make beam collimation, then inject relevant THz wave producer.
7. the THz wave real time imagery method based on optical parameter is changed according to claim 1, is characterized in that: step 4] in, between nonlinear images conversion gain medium and optical imaging system, be provided with near infrared wave filter.
8. based on the THz wave real-time imaging devices that optical parameter is changed, it is characterized in that: comprise conversion equipment, optical imaging system and computing machine near infrared pumping source, relevant THz wave producer, THz wave optical parameter, on THz wave optical parameter, conversion equipment comprises nonlinear images conversion gain medium; Relevant THz wave producer exports relevant THz ripple, irradiate object, produce the THz ripple image carrying object spectral information, the light that THz ripple image and near infrared pumping source send is jointly as the input of conversion equipment on THz wave optical parameter, on THz wave optical parameter, conversion equipment is connected with computing machine through optical imaging system, and running, the bandwidth sum PRI characters of THz ripple image and the light that near infrared pumping source sends are identical.
9. imaging device according to claim 8, is characterized in that: in the input path of nonlinear images conversion gain medium, be also provided with the off axis paraboloidal mirror group be made up of the gold-plated off-axis parabolic mirror of two panels.
10. imaging device according to claim 9, is characterized in that: the light that near infrared pumping source sends is divided into two bundles through beam splitting chip, is a branch ofly incident to relevant THz wave producer, and another bundle is incident to conversion equipment on THz wave optical parameter.
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| JP2017138461A (en) * | 2016-02-03 | 2017-08-10 | 澁谷工業株式会社 | Terahertz light generator |
| CN106444346B (en) * | 2016-10-31 | 2018-12-14 | 中国科学院西安光学精密机械研究所 | A kind of sub- femtosecond time resolution streak camera of Terahertz driving |
| CN109242753B (en) * | 2018-08-22 | 2020-09-29 | 中国科学院西安光学精密机械研究所 | Cross modulation instability-based low-light image stochastic resonance reconstruction method and device |
| CN110108657A (en) * | 2019-04-30 | 2019-08-09 | 中国科学院西安光学精密机械研究所 | The hypersensitivity mid-long wavelength IR images method and imaging system of room temperature operating |
| CN110954498A (en) * | 2019-12-17 | 2020-04-03 | 山东大学 | Terahertz wave high-spectrum imaging system based on frequency conversion |
| CN112414564B (en) * | 2020-11-19 | 2022-03-22 | 中国工程物理研究院激光聚变研究中心 | Terahertz frequency measuring device and method |
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